<!DOCTYPE html>
<html>
  <head>
    <title> CSS Scroll Snap 2 Test: scrollsnapchange events</title>
    <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/resources/testdriver.js"></script>
    <script src="/resources/testdriver-actions.js"></script>
    <script src="/resources/testdriver-vendor.js"></script>
    <script src="/css/css-scroll-snap-2/resources/common.js"></script>
    <script src="/dom/events/scrolling/scroll_support.js"></script>
    <script src="/css/css-scroll-snap/support/common.js"></script>
  </head>
  <body>
    <style>
      .scroller {
        overflow: scroll;
        width: 200px;
        height: 200px;
        border: solid 1px black;
        scroll-snap-type: y mandatory;
        position: absolute;
        resize: both;
      }
      .snaparea {
        scroll-snap-align: start;
        height: 50px;
        width: 50px;
        color: white;
        margin-top: 100px;
        background-color: purple;
      }
      .space {
        height: 300vh;
        width: 300vw;
        position: absolute;
      }
    </style>
    <div class="scroller" id="scroller">
      <div class="space"></div>
      <div class="snaparea"> Area2</div>
      <div class="snaparea"> Area1</div>
    </div>

    <script>
      promise_test(async (t) => {
        await waitForCompositorCommit();

        scroller.focus();

        const scrollsnapchange_promise = waitForSnapEvent(scroller, "scrollsnapchange");
        await test_driver.send_keys(scroller, KEY_CODE_MAP["ArrowRight"]);
        const snap_event = await scrollsnapchange_promise;

        assert_equals(snap_event, null, "no scrollsnapchange event fired as " +
          "scroller doesn't snap in the x axis");
      }, "keyboard scroll on non-snapping axis doesn't trigger scrollsnapchange");

      promise_test(async (t) => {
        await waitForScrollReset(t, scroller);
        await waitForCompositorCommit();
        scroller.focus();

        const scrollsnapchange_promise = waitForSnapEvent(scroller, "scrollsnapchange");
        const wheel_scroll_amount = 25;
        new test_driver.Actions().scroll(0, 0,
          wheel_scroll_amount,
          0,
          { origin: scroller }).send();
        const snap_event = await scrollsnapchange_promise;
        assert_equals(snap_event, null, "no scrollsnapchange event fired as " +
          "scroller doesn't snap in the x axis");
      }, "wheel scroll on non-snapping axis doesn't trigger scrollsnapchange");
    </script>
  </body>
</html>
